Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended	65 Months Ended
	Jan. 16, 2020	Dec. 31, 2019	Dec. 31, 2019	Oct. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Dividends Payable [Line Items]
Treasury stock, shares		10,932,182	10,932,182			5,535,574
Treasury Stock, Value		$ 119,808	$ 119,808			$ 58,162
Stock Repurchase Program, Authorized Amount, Increase (Decrease)				$ 100,000
Stock Repurchase Program, Authorized Amount		$ 200,000	$ 200,000		$ 100,000
Repurchase of common stock, Shares		5,396,608	6,515,957
Repurchase of common stock		$ 61,600	$ 81,400
Unrealized losses, net of tax		$ (11,064)	$ (11,064)			$ (16,016)
Subsequent Event [Member] | Green Plains Partners LP [Member]
Dividends Payable [Line Items]
Quarterly cash distribution per unit declared	$ 0.475